I created an empty study on PsychoPy on another computer (MacOS), synced/created a new Pavlovia project for it via the Builder, transferred it on the Ubuntu 24.04 computer (with the .git file). When opening the .psyexp, the project is linked to my Pavlovia account and the new project and I can sync it with Pavlovia without PsychoPy crashing !
So the issue on Ubuntu might only be linked to the step of creating a new Pavlovia project via the Builder on Ubuntu 24.04 with both PsychopPy 2024.2.4 or 2024.2.5.
I also installed Psychopy (2025.2.5 Py 3.8) on Linux (Mint Cinnamon v.22.1) with that script and incurred in a similar problem.
Everything runs just fine, I can also login in my Pavlovia account, but as soon as I click on the arrow next to “no project” and click on either “new project” or “search project…” it crashes without leaving an error message.
I haven’t managed to solve it, but I can use OP’s workaround for the moment.
There may be an error message in the last log file after this crash - try looking in your psychopy user folder (/home/username/.psychopy3 on Linux) for the file last_app_load.log. If you share the traceback from there it’ll give me more to go on with tracking down the cause.